Column, Pedestal, Base Cap. Urn or Pier in a monolithic form-right upon the job. These may be molded in units or blocks, and then built up to suit the specifications demanded. This work is fully illustrated, with detailed engravings. Price

$2.00 POPULAR HANDBOOK FOR CEMENT AND CONCRETE USERS. BY MYRON H. LEWIS.

This is a concise treatise of the principles and methods employed in the manufacture
and use of cement in all classes of modern works. The author has brought together
in this work all the salient matter of interest to the user of concrete and its many
diversified products. The matter is presented in logical and systematic order, clearly
written, fully illustrated and free from involved mathematics. Everything of value to
the concrete user is given, including kinds of cement employed in construction, concrete
architecture, inspection and testing, waterproofing, coloring and painting, rules, tables,
working and cost data. The book comprises thirty-three chapters, as follows:
Introductory. Kinds of Cements and How They are Made. Properties. Testing
and Requirements of Hydraulic Cement. Concrete and its Properties. Sand, Broker
Stone and Gravel for Concrete. How to Proportion the Materials. How to Mix
and Place Concrete. Forms of Concrete Construction. The Architectural and Artistic
Possibilities of Concrete. Concrete Residences. Mortars, Plasters and Stucco and
How to Use Them. The artistic Treatment of Concrete Surfaces. Concrete Building
Blocks. The Making of Ornamental Concrete. Concrete Pipes, Fences, Posts, etc.
Essential Features and Advantages of Reenforced Concrete. How to Design Reen-
forced Concrete Beams, Slabs and Columns. Explanations of the Methods and
Principles in Designing_Reenforced Concrete Beams and Slabs. Systems of Reen-
forcement Employed. Reenforced Concrete in Factory and General Building Con-
struction. Concrete in Foundation Work. Concrete Retaining Walls, Abutments
and Bulkheads. Concrete Arches and Arch Bridges. Concrete Beam and Girder
Bridges. Concrete in Sewerage and Drainage Works. Concrete Tanks, Dams and
Reservoirs. Concrete Sidewalks, Curbs and Pavements. Concrete in Railroad Con-
structions. The Utility of Concrete on the Farm. The Waterproofing of Concrete
Structure. Grout or Liquid Concrete and Its Use. Inspection of Concrete Work. Cost
of Concrete Work. Some of the special features of the book are: 1. The Attention
Paid to the Artistic and Architectural Side of Concrete Work. 2. The Authoritative
Treatment of the Problem of Waterproofing Concrete. 3. An Excellent Summary of
the Rules to be Followed in Concrete Construction. 4. The Valuable Cost Data and
Useful Tables given. A valuable Addition to the Library of Every Cement and
Concrete User. Price
$2.50

WHAT IS SAID OF THIS BOOK:

"The field of Concrete Construction is well covered and the matter contained is well within the understanding of any person."-Engineering-Contracting.

04 Should be on the bookshelves of every contractor, engineer and architect in the land."-National Builder.

WATERPROOFING CONCRETE. By MYRON H. LEWIS.

Modern Methods of Waterproofing Concrete and Other Structures. A condensed
statement of the Principles, Rules, and Precautions to be Observed in Waterproofing
and Dampproofing Structures and Structural Materials. Paper binding. Illustrated.
Price
50 cents

DICTIONARIES

STANDARD ELECTRICAL DICTIONARY. By T. O'CONOR SLOANE.

An indispensable work to all interested in electrical science. Suitable alike for the
student and professional. A practical handbook of reference containing definitions of
about 5000 distinct words, terms and phrases. The definitions are terse and concise
and include every term used in electrical science. Recently issued. An entirely new
edition. Should be in the possession of all who desire to keep abreast with the progress
of this branch of science. Complete, concise and convenient. 682 pages. 393 illustra-
tions. Price
$3.00

DIES METAL WORK

DIES: THEIR CONSTRUCTION AND USE FOR THE MODERN WORKING OF
SHEET METALS. By J. V. WOODWORTH.

A most useful book, and one which should be in the hands of all engaged in the press
working of metals; treating on the Designing, Constructing, and Use of Tools, Fixtures
and Devices, together with the manner in which they should be used in the Power
Press, for the cheap and rapid production of the great variety of sheet-metal articles
now in use. It is designed as a guide to the production of sheet-metal parts at the
minimum of cost with the maximum of output. The hardening and tempering of
Press tools and the classes of work which may be produced to the best advantage by
the use of dies in the power press are fully treated. Its 505 illustrations show dies,
press fixtures and sheet-metal working devices, the descriptions of which are so clear and
practical that all metal-working mechanics will be able to understand how to design,
construct and use them. Many of the dies and press fixtures treated were either
constructed by the author or under his supervision. Others were built by skilful
mechanics and are in use in large sheet-metal establishments and machine shops.
5th Edition. Price
$3.00

PUNCHES, DIES AND TOOLS FOR MANUFACTURING IN PRESSES. By J. V. WOODWORTH.

This work is a companion volume to the author's elementary work entitled "Dies, Their Construction and Use." It does not go into the details of die making to the extent of the author's previous book, but gives a comprehensive review of the field of operations carried on by presses. A large part of the information given has been drawn from the author's personal experience. It might well be termed an Encyclopedia of Die Making, Punch Making, Die Sinking, Sheet Metal Working, and Making of Special Tools, Subpresses, Devices and Mechanical Combinations for Punching, Cutting, Bending, Forming, Piercing, Drawing, Compressing and Assembling Sheet Metal Parts, and also Articles of other Materials in Machine Tools. 2d Edition. Price. $4.00 DROP FORGING, DIE-SINKING AND MACHINE-FORMING OF STEEL. By J. V. WOODWORTH.

This is a practical treatise on Modern Shop Practice, Processes, Methods, Machines,
Tools, and Details treating on the Hot and Cold Machine-Forming of Steel and Iron
into Finished shapes; Together with Tools, Dies, and Machinery involved in the
manufacture of Duplicate Forgings and Interchangeable Hot and Cold Pressed Parts
from Bar and Sheet Metal. This Book fills a demand of long standing for information
regarding drop forgings, die-sinking and machine-forming of steel and the shop
practice involved, as it actually exists in the modern drop-forging shop. The processes
of die-sinking and force-making, which are thoroughly described and illustrated in this
admirable work, are rarely to be found explained in such a clear and concise manner
as is here set forth. The process of die-sinking relates to the engraving or sinking of
the female or lower dies, such as are used for drop forgings, hot and cold machine
forging, swedging and the press working of metals. The process of force-making
relates to the engraving or raising of the male or upper dies used in producing the
lower dies for the press-forming and machine-forging of duplicate parts of metal.
In addition to the arts above mentioned the book contains explicit information re-
garding the drop forging and hardening plants, designs, conditions, equipment, drop
hammers, forging machines, etc., machine forging, hydraulic forging, autogenous
welding and shop practice. The book contains eleven chapters, and the information
contained in these chapters is just what will prove most valuable to the forged-metal
worker. All operations described in the work are thoroughly illustrated by means of
perspective half-tones and outline sketches of the machinery employed. 300 detailed
illustrations. Price
$2.50

DRAWING SKETCHING PAPER

LINEAR PERSECTIVE SELF-TAUGHT. By HERMAN T. C. KRAUS.

This work gives the theory and practice of linear perspective, as used in architectural
engineering and mechanical drawings. Persons taking up the study of the subject
by themselves will be able, by the use of the instruction given, to readily grasp the
subject, and by reasonable practice become good perspective draftsmen. The arrange-
ment of the book is good; the plate is on the left-hand, while the descriptive text
follows on the opposite page, so as to be readily referred to. The drawings are on
sufficiently large scale to show the work clearly and are plainly figured. The whole
work makes a very complete course on perspective drawing, and will be found of
great value to architects, civil and mechanical engineers, patent attorneys, art designers,
engravers, and draftsmen.
$2.50

PRACTICAL PERSPECTIVE. By RICHARDS and COLVIN.

Shows just how to make all kinds of mechanical drawings in the only practical perspective isometric. Makes everything plain so that any mechanic can understand a sketch or drawing in this way. Saves time in the drawing room, and mistakes in the shops. Contains practical examples of various classes of work. 3rd Edition. 50 cents

SELF-TAUGHT MECHANICAL DRAWING AND ELEMENTARY MACHINE DESIGN. By F. L. SYLVESTER, M.E., Draftsman, with additions by ERIK OBERG, associate editor of "Machinery."

This is a practical treatise on Mechanical Drawing and Machine Design, comprising the first principles of geometric and mechanical drawing, workshop mathematics, mechanics, strength of materials and the calculations and design of machine details. The author's aim has been to adapt this treatise to the requirements of the practical mechanic and young draftsman and to present the matter in as clear and concise a manner as possible. To meet the demands of this class of students, practically all the important elements of machine design have been dealt with, and in addition algebraic formulas have been explained, and the elements of trigonometry treated in the manner best suited to the needs of the practical man. The book is divided into 20 chapters, and in arranging the material, mechanical drawing, pure and simple, has been taken up first, as a thorough understanding of the principles of representing objects facilitates the further study of mechanical subjects. This is followed by the mathematics necessary for the solution of the problems in machine design which are presented later, and a practical introduction to theoretical mechanics and the strength of materials. The various elements entering into machine design, such as cams, gears, sprocket wheels, cone pulleys, bolts, screws, couplings, clutches, shafting and fly-wheels have been treated in such a way as to make possible the use of the work as a text-book for a continuous course of study. It is easily comprehended and assimilated even by students of limited previous training. 330 pages, 215 engravings. Price $2.00

A NEW SKETCHING PAPER.

A new specially ruled paper to enable you to make sketches or drawings in isometric
perspective without any figuring or fussing. It is being used for shop details as well
as for assembly drawings, as it makes one sketch do the work of three, and no workman
can help seeing just what is wanted. Pads of 40 sheets, 6x9 inches, 25 cents. Pads
of 40 sheets, 9x12 inches, 50 cents; 40 sheets, 12x18, Price
$1.00

ELECTRICITY

ARITHMETIC OF ELECTRICITY. By Prof. T. O'CONOR SLOANE.

A practical treatise on electrical calculations of all kinds reduced to a series of rules, all
of the simplest forms, and involving only ordinary arithmetic; each rule illustrated
by one or more practical problems, with detailed solution of each one. This book is
classed among the most useful works published on the science of electricity, covering
as it does the mathematics of electricity in a manner that will attract the attention
of those who are not familiar with algebraical formulas. 20th Edition. 160 pages.
Price
$1.00

COMMUTATOR CONSTRUCTION. By Wm. Baxter, Jr.

The business end of any dynamo or motor of the direct current type is the commutator. This book goes into the designing, building, and maintenance of commutators, shows how to locate troubles and how to remedy them; everyone who fusses with dynamos needs this. 4th Edition. 25 cents DYNAMO BUILDING FOR AMATEURS, OR HOW TO CONSTRUCT A FIFTYWATT DYNAMO. BY ARTHUR J. WEED, Member of N. Y. Electrical Society. A practical treatise showing in detail the construction of a small dynamo or motor, the entire machine work of which can be done on a small foot lathe. Dimensioned working drawings are given for each piece of machine work, and each operation is clearly described. This machine, when used as a dynamo, has an output of fifty watts; when used as a motor it will drive a small drill press or lathe. It can be used to drive a sewing machine on any and all ordinary work. The book is illustrated with more than sixty original engravings showing the actual construction of the different parts. Among the contents are chapters on: 1. Fifty-Watt Dynamo. 2. Side Bearing Rods. 3. Field Punching. 4. Bearings. 5. Commutator. 6. Pulley. 7. Brush Holders. 8. Connection Board. 9. Armature Shaft. 10. Armature. 11. Armature Winding. 12. Field Winding. 13. Connecting and Starting. Price, paper, 50 cents. Cloth $1.00

ELECTRIC FURNACES AND THEIR INDUSTRIAL APPLICATION.

WRIGHT.

By J.

This is a book which will prove of interest to many classes of people; the manufacturer who desires to know what product can be manufactured successfully in the electric furnace, the chemist who wishes to post himself on the electro-chemistry, and the student of science who merely looks into the subject from curiosity. The book is not so scientific as to be of use only to the technologist nor so unscientific as to suit only the tyro in electro-chemistry; it is a practical treatise of what has been done, and of what is being done, both experimentally and commercially, with the electric furnace. In important processes not only are the chemical equations given, but complete thermal data are set forth, and both the efficiency of the furnace and the cost of the product are worked out, thus giving the work a solid commercial value aside from its efficacy as a work of reference. The practical features of furnace building are given the space that the subject deserves. The forms are refractory materials used in the linings, the arrangement of the connections to the electrodes, and other important details are explained. 288 pages. New Revised Edition. Fully illustrated. Price. $3.00

ELECTRIC LIGHTING AND HEATING POCKET-BOOK.

WALKER.

By SYDNEY F.

This book puts in convenient form useful information regarding the apparatus which is
likely to be attached to the mains of an electrical company. Tables of units and equiv.
alents are included and useful electrical laws and formulas are stated.

One section is devoted to dynamos, motors, transformers and accessory apparatus
another to accumulators, another to switchboards and related equipment, a fourth t
a description of various systems of distribution, a fifth section to a discussion of instru
ments, both for portable use and switchboards; another section deals with electric lamp
of various types and accessory appliances, and the concluding section is given up t
electric heating apparatus. In each section a large number of commercial types are de
scribed, frequent tables of dimensions being included. A great deal of detail informa
tion of each line of apparatus is given, and the illustrations shown give a good idea o
the general appearance of the apparatus under discussion. The book also contains much
valuable information for the central station engineer. 438 pages. 300 engravings.
Bound in leather pocket-book form. Price
$3.00
By NEWTON

ELECTRIC WIRING, DIAGRAMS AND SWITCHBOARDS.

HARRISON.

A thoroughly practical treatise covering the subject of Electric Wiring in all its branches, including explanations and diagrams which are thoroughly explicit and greatly simplify the subject. Practical, every-day problems in wiring are presented and the method of obtaining intelligent results clearly shown. Only arithmetic is used. Ohm's law is given a simple explanation with reference to wiring for direct and alternating currents. The fundamental principle of drop of potential in circuits is shown with its

various applications. The simple circuit is developed with the position of mains, feeders and branches; their treatment as a part of a wiring plan and their employment in house wiring clearly illustrated. Some simple facts about testing are included · in connection with the wiring. Molding and conduit work are given careful consideration; and switchboards are systematically treated, built up and illustrated, showing the purpose they serve, for connection with the circuits, and to shunt and compound wound machines. The simple principles of switchboard construction, the development of the switchboard, the connections of the various instruments, including the lightning arrester, are also plainly set forth.

Alternating current wiring is treated, with explanations of the power factor, conditions calling for various sizes of wire, and a simple way of obtaining the sizes for single-phase, two-phase and three-phase circuits. This is the only complete work issued showing and telling you what you should know about direct and alternating current wiring. It is a ready reference. The work is free from advanced technicalities and mathematics, arithmetic being used throughout. It is in every respect a handy, well-written, instructive, comprehensive volume on wiring for the wireman, foreman, contractor, or electrician. 272 pages; 105 illustrations. Price $1.50 ELECTRIC TOY MAKING, DYNAMO BUILDING, AND ELECTRIC MOTOR CONSTRUCTION. By Prof. T. O'CONOR SLOANE.

This work treats of the making at home of electrical toys, electrical apparatus, motors, dynamos and instruments in general, and is designed to bring within the reach of young and old the manufacture of genuine and useful electrical appliances. The work is especially designed for amateurs and young folks.

Thousands of our young people are daily experimenting, and busily engaged in making electrical toys and apparatus of various kinds. The present work is just what is wanted to give the much needed information in a plain, practical manner, with illustrations to make easy the carrying out of the work. 20th Edition, enlarged. Price $1.00

PRACTICAL ELECTRICITY. By Prof. T. O'CONOR SLOANE.

This work of 768 pages was previously known as Sloane's Electricians' Hand Book, and
is intended for the practical electrician who has to make things go. The entire
field of electricity is covered within its pages. Among some of the subjects treated
are: The Theory of the Electric Current and Circuit, Electro-Chemistry, Primary
Batteries, Storage Batteries, Generation and Utilization of Electric Powers, Aiter-
nating Current, Armature Winding, Dynamos and Motors, Motor Generators,
Operation of the Central Station Switchboards, Safety Appliances, Distribution
of Electric Light and Power, Street Mains, Transformers, Arc and Incandescent
Lighting, Electric Measurements, Photometry, Electric Railways, Telephony, Bell-
Wiring, Electric-Plating, Electric Heating, Wireless Telegraphy, etc. It contains no
useless theory; everything is to the point. It teaches you just what you want to
know about electricity. It is the standard work published on the subject. Forty-
one chapters, 556 engravings. Price
$2.50

ELECTRICITY SIMPLIFIED. By Prof. T. O'CONOR SLOANE.

The object of "Electricity Simplified" is to make the subject as plain as possible and
to show what the modern conception of electricity is; to show how two plates of
different metal, immersed in acid, can send a message around the globe; to explain
how a bundle of copper wire rotated by a steam engine can be the agent in lighting
our streets, to tell what the volt, ohm and ampere are, and what high and low tension
mean; and to answer the questions that perpetually arise in the mind in this age of
electricity. 13th Edition. 172 pages. Illustrated. Price
$1.00

HOUSE WIRING. BY THOMAS W. POPPE.

This work describes and illustrates the actual installation of Electric Light Wiring,
the manner in which the work should be done, and the method of doing it. The book
can be conveniently carried in the pocket. It is intended for the Electrician, Helper
and Apprentice. It solves all Wiring Problems and contains nothing that conflicts
with the rulings of the National Board of Fire Underwriters. It gives just the informa-
tion essential to the Successful Wiring of a Building. Among the subjects treated are:
Locating the Meter. Panel Boards. Switches. Plug Receptacles. Brackets, Ceiling
Fixtures. The Meter Connections. The Feed Wires. The Steel Armored Cable
System. The Flexible Steel Conduit System. The Ridig Conduit System. A digest
of the National Board of Fire Underwriters' rules relating to metallic wiring systems.
Various switching arrangements explained and diagrammed. The easiest method of
testing the Three- and Four-way circuits explained. The grounding of all metallic
wiring systems and the reason for doing so shown and explained. The insulation of
the metal parts of lamp fixtures and the reason for the same described and illustrated.
125 pages. Fully illustrated. Flexible cloth. Price
50 cents

WHAT IS SAID OF THIS BOOK: "The information given is exact and exhaustive without being too technical or overladen with details."-Druggists' Circular.

HOW TO BECOME A SUCCESSFUL ELECTRICIAN. By Prof. T. O'CONOR SLOANE.

Every young man who wishes to become a successful electrician should read this book. It tells in simple language the surest and easiest way to become a successful electrician. The studies to be followed, methods of work, field of operation and the requirements of the successful electrician are pointed out and fully explained. Every young engineer will find this an excellent stepping stone to more advanced works on electricity which he must master before success can be attained. Many young men become discouraged at the very outstart by attempting to read and study books that are far

beyond their comprehension. This book serves as the connecting link between the rudiments taught in the public schools and the real study of electricity. It is interesting from cover to cover. Eighteenth Revised Edition, just issued. 205 pages. Illustrated. Price

MANAGEMENT OF DYNAMOS. By LUMMIS-PATERSON.

$1.00

A handbook of theory and practice. This work is arranged in three parts. The first
part covers the elementary theory of the dynamo. The second part, the construction
and action of the different classes of dynamo in common use, are described; while
the third part relates to such matters as affect the practical management and working
of dynamos and motors. The following chapters are contained in the book: Electrical
Units; Magnetic Principles; Theory of the Dynamo; Armature; Armature in
Practice; Field Magnets; Field Magnets in Practice; Regulating Dynamos; Coupling
Dynamos; Installation, Running, and Maintenance of Dynamos; Faults in Dynamos;
Faults in Armatures; Motors. 292 pages. 117 illustrations. Price
$1.50

STANDARD ELECTRICAL DICTIONARY. By T. O'CONOR SLOANE.

An indispensable work to all interested in electrical science. Suitable alike for the
student and professional. A practical handbook of reference containing definitions
of about 5,000 distinct words, terms and phrases. The definitions are terse and
concise and include every term used in electrical science. Recently issued. An en-
tirely new edition. Should be in the possession of all who desire to keep abreast with
the progress of this branch of science. In its arrangement and typography the book
is very convenient. The word or term defined is printed in black-faced type which
readily catches the eye, while the body of the page is in smaller but distinct type.
The
definitions are well worded, and so as to be understood by the non-technical reader.
The general plan seems to be to give an exact, concise definition, and then amplify
and explain in a more popular way. Synonyms are also given, and references to other
words and phrases are made. A very complete and accurate index of fifty pages is
at the end of the volume; and as this index contains all synonyms, and as all phrases
are indexed in every reasonable combination of words, reference to the proper place
in the body of the book is readily made. It is difficult to decide how far a book of
this character is to keep the dictionary form, and to what extent it may assume the
encyclopedia form. For some purposes, concise, exactly worded definitions are needed;
for other purposes, more extended descriptions are required. This book seeks to satisfy
both demands, and does it with considerable success. Complete, concise and con-
venient. 682 pages. 393 illustrations. Twelfth Edition. Price
$3.00

SWITCHBOARDS. BY WILLIAM BAXTER, JR.

This book appeals to every engineer and electrician who wants to know the practical
side of things. It takes up all sorts and conditions of dynamos, connections and
circuits, and shows by diagram and illustration just how the switchboard should be
connected. Includes direct and alternating current boards, also those for arc lighting,
incandescent, and power circuits. Special treatment on high voltage boards for power
transmission. 2d Edition. 190 pages. Illustrated. Price
$1.50

TELEPHONE CONSTRUCTION, INSTALLATION, WIRING, OPERATION
AND MAINTENANCE. By W. H. RADCLIFFE and H. C. CUSHING.
This book is intended for the amateur, the wireman, or the engineer who desires to
establish a means of telephonic communication between the rooms of his home, office,
or shop. It deals only with such things as may be of use to him rather than with
theories.

Gives the principles of construction and operation of both the Bell and Independent instruments; approved methods of installing and wiring them; the means of protecting them from lightning and abnormal currents; their connection together for operation as series or bridging stations; and rules for their inspection and maintenance. Line wiring and the wiring and operation of special telephone systems are also treated. Intricate mathematics are avoided, and all apparatus, circuits and systems are thoroughly described. The appendix contains definitions of units and terms used in the text. Selected wiring tables, which are very helpful, are also included. Among the subjects treated are Construction, Operation, and Installation of Telephone Instruments; Inspection and Maintenance of Telephone Instruments; Telephone Line Wiring; Testing Telephone Line Wires and Cables; Wiring and Operation of Special Tel phone Systems, etc. Second Edition, enlarged and revised. 200 pages. 150 illustrations. Price $1.00 WIRELESS TELEGRAPHY AND TELEPHONY SIMPLY EXPLAINED. By ALFRED P. MORGAN.

This is undoubtedly one of the most complete and comprehensible treatises on the
subject ever published, and a close study of its pages will enable one to master all the
details of the wireless transmission of messages. The author has filled a long-felt
want and has succeeded in furnishing a lucid, comprehensible explanation in simple
language of the theory and practice of wireless telegraphy and telephony.
Among the contents are: Introductory; Wireless Transmission and Reception-The
Aerial System, Earth Connections-The Transmitting Apparatus, Spark Coils and
Transformers, Condensers, Helixes, Spark Gaps, Anchor Gaps, Aerial Switches-The
Receiving Apparatus, Detectors, etc.-Tuning and Coupling, Tuning Coils, Loose
Couplers, Variable Condensers, Directive Wave Systems-Miscellaneous Apparatus.
Telephone Receivers, Range of Stations, Static Interference-Wireless Telephones.
Sound and Sound Waves, The Vocal Chords and Ear-Wireless Telephone, How Sounds
Are Changed into Electric Waves-Wireless Telephones, The Apparatus-Summary.
154 pages.
156 engravings. Price
$1.00
"This book should be in both the home and school library."-The Youths' Instructor:

WHAT IS SAID OF THIS BOOK: